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GTETD 檢索結果共 3958 筆,本頁資料從第 193 筆到第 204 筆

When excitable cardiac tissue is electrically paced at a sufficiently high rate, the duration of excitation can alternate from beat to beat despite a constant stimulation period. This rhythm, known as alternans, has been identified as an early stage in a sequence of increasingly complex instabilities leading to the lethal arrhythmia ventricular fibrillation (VF). This c....

By Alejandro Garzon-Physics-GIT-doctoral-2010-08-24
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A graph is (t+1)-critical if it is not t-colorable, but every proper subgraph is. In this thesis, we study the structure of critical graphs on higher surfaces. One major result in this area is Carsten Thomassen's proof that there are finitely many 6-critical graphs on a fixed surface. This proof involves a structural theorem about a precolored cycle C of length q. In ge....

By Carl Roger Yerger Jr.-Mathematics-GIT-doctoral-2010-08-23
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Rhythmic neural activity is thought to underlie many high-level functions of the nervous system. Our goals are to understand rhythmic activity starting with small networks, using theoretical and experimental tools. Phase resetting theory describes essential properties that cause and destroy rhythms. We validate and extend one branch of this theory, testing it in burstin....

By Fred H Sieling-Biomedical Engineering-GIT-doctoral-2010-08-23
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Three-phase porous composites containing electrolyte (ionic conductor), electronic conductor, and porosity phases are frequently used for solid oxide fuel cell (SOFC) electrodes. Performance of such electrodes is microstructure sensitive. Topological connectivity of the microstructural phases and total length of triple phase boundaries are the key microstructural parame....

By Shenjia Zhang-Materials Science & Engineering-GIT-doctoral-2010-08-23
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Nanowire structure plays an important role in the development of nanotechnology. However, further study shows that the shape of nanowires may not be the ideal morphology for some applications such as solar cells and sensors. Thus, the purpose of this thesis is to find a low cost and high yield approach to the synthesis of other morphologies of nanostructures in order to....

By Yanling Chang-Materials Science & Engineering-GIT-masters-2010-08-12
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The jet-in-crossflow problem has been extensively studied, mainly because of its applications in film cooling and injector designs. It has been established that in low-speed flows, pulsing the jet significantly enhances mixing and jet penetration. This work investigates the effects of pulsing on mixing and jet trajectory in high speed (compressible) flow, using Large E....

By Venkata-Ramya Pasumarti-Aerospace Engineering-GIT-masters-2010-08-12
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Efficient and effective vision systems are proposed in this work for object detection for ground & aerial robots venturing into unknown environments with minimum vision aids, i.e. a single camera. The first problem attempted is that of object search and identification in a situation similar to a disaster site. Based on image analysis, typical pixel-based characteristics....

By Syed Irtiza Ali Shah-Aerospace Engineering-GIT-doctoral-2010-08-11
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In this thesis we study Mahler's conjecture in convex geometry, give a short summary about its history, gather and explain different approaches that have been used to attack the conjecture, deduce formulas to calculate the Mahler volume and perform numerical analysis on it. The conjecture states that the Mahler volume of any symmetric convex body, i.e. the product of th....

By Philipp Hupp-Mathematics-GIT-masters-2010-08-09
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Tolerances play an important role in product fabrication. Tolerances impact the needs of the designer and the manufacturer. Engineering designers are concerned with the impact of tolerances on the variation of the output, while manufacturers are more concerned with the cost of fitting the parts. Traditional tolerance control methods do not take into account both these ....

By Abhishek Kumar-Mechanical Engineering-GIT-masters-2010-08-05
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Innovation ecosystem strategy is often adopted by platform technology owners to seek complementary innovation from resources located outside the firm to exploit indirect network effect. In this dissertation I aim to address the issues that are related to the formation and business value of platform innovation ecosystems in the enterprise software industry. The first stu....

By Peng Huang-Management-GIT-doctoral-2010-08-05
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The ever-increasing need for higher bandwidth and density is one of the motivations for extensive research on planar optoelectronic structures on printed circuit board (PCB) substrates. Among these applications, optical interconnects have received considerable attention in the last decade. Several optical interconnect techniques, such as free space, guided wave, board l....

By Fengtao Wang-Electrical and Computer Engineering-GIT-doctoral-2010-08-03
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Cold trapped ions have many applications in quantum information science and precision metrology. In this thesis, we present progress toward two objectives involving ions confined to linear RF traps: the strong coupling of Ba+ ions with a high finesse optical cavity, and the observation of an optical nuclear transition in 229Th3+. In pursuit of the first objective, a nov....

By Layne Russell Churchill-Physics-GIT-doctoral-2010-08-03
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